Abstract
Preparative layer chromatography of the ethereal extracts of a chemical strain of the lichen Xanthopannelia scabrosa (Tayl.) Hale has led to our isolating four novel nitrogen containing esters' in addition to the known metabolites, usnic acid (1) and norlobaridone (2). The multicyclic diol moiety from which natural esters are derived has been termed scabrosin. Hence we describe the new metabolites as scabrosin 4,4'-diacetate (31, 0 m.p. 262 , scabrosin 4-acetate-4'-butyrate (4), m.p. 216-S-217.5', [a];,', -960G, scabrosin 4,4'-dibutyrate (2): m.p. 196-7' and scabrosin 4-acetate-4'-hexanoate (6), m.p. 213'. en3 OH 0 CH oa3
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